RFR: 8311821: Simplify ParallelGCThreadsConstraintFunc after CMS removal [v2]

[Aleksey Shipilev]

On Fri, 21 Jul 2023 19:16:51 GMT, Jenny Shivayogi <duke at openjdk.org> wrote:

>> Code oddities reported by SonarCloud after CMS removal
>> Fix: moving ParallelGCThreadsConstraintFuncParallel to shared code as ParallelGCThreadsConstraintFunc
>
> Jenny Shivayogi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   replacing constraint func with range, max_jint with INT_MAX

I don't think we need `ParallelGCThreadsConstraintFunc` at all now, seeing how we removed its only (?) use.

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PR Comment: https://git.openjdk.org/jdk/pull/14965#issuecomment-1646162549